精英家教网 > 小学数学 > 题目详情
3
4
+
1
2
=
1
3
-
1
4
=
12×
3
4
=
1
5
÷3=
2
7
×14=
20÷
4
9
=
2
3
×
7
8
=
2
13
=
2
5
÷
3
2
=
1
2
÷
2
3
=
5
7
÷1=
14×
5
7
÷14×
5
7
=
分析:前两题按分数加减法的运算法则计算,最后一题按从左到右的顺序计算,其余题目按分数乘除法的计算法则运算.
解答:解:
3
4
+
1
2
=
5
4
        
1
3
-
1
4
=
1
12
                       12×
3
4
=9                     
1
5
÷3=
1
15

2
7
×14=4             20÷
4
9
=45                      
2
3
×
7
8
=
7
12
                   0×
2
13
=0
2
5
÷
3
2
=
4
15
           
1
2
÷
2
3
=
3
4
                     
5
7
÷1=
5
7
                     14×
5
7
÷14×
5
7
=
25
49
点评:最后一题要按运算顺序计算,不要被数字所迷惑写成了1.
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